Properties of the Number 605

Six Hundred Five

Basics

Value: 604 → 605 → 606

Parity: odd

Prime: No

Previous Prime: 601

Next Prime: 607

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 5 × 11 ²

Divisors: 1, 5, 11, 55, 121, 605

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001011101

Octal: 1135

Duodecimal: 425

Hexadecimal: 25d

Square: 366025

Square Root: 24.596747752497688

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of non-isomorphic set-systems of weight n. A283877

Odd numbers of the form p^1+4k * r², where p is prime of the form 1+4m, r > 1, and gcd(p,r) = 1. (Euler's criteria for odd perfect numbers). A228058

Number of fractions in Farey series of order n. A5728

Indices k such that (1/3)*(prime(k)+prime(k+1)+prime(k+2)) is a prime. A64113

a(n) = n*(n+1)²/2. A6002

Number of integer partitions of n such that it is not possible to choose a different prime factor of each part. A370593

Position of the start of the first occurrence of n after the decimal point in π = 3.14159265358979323846264338327950288... A14777

a(n) = 5·n². A33429

Cyclops numbers. A134808

Numbers whose sum of digits is 11. A166311